Spring.



W. R. PARKA SPRING.

APPLICATION FILED SEPT. 22, 1911.

LGQST/a Patented Apr. 23, 1.912.

- "la un QAES PATENT FFQE,

`VILAM R. PARK, 0F TAUNTON, MASSACHUSETTS, ASSIGNOR TO HIMSELF, AS TRUSTEE.

SPRING'.

Ee it liiioivn that l, WILLIAM R. PARK, a citizen o the United States, and resident of en, in the county of Bristol and State ot' Idassz'ichusetts, have invented new and useful linprovenients in Springs, of which the following is a specification.

invention relates to the construction of springs for vehicles, and has for its objectt-he provision of springs Whicli.wliile ca pablD of yielding to road shocks, will do so with a retarded or sluggish response, so as to avoid the disagreeable and sometimes damaging f bounce, which many persons have experienced, and which has stimulated inventors to contrive shock absorbers of miscellaneous construction, all of which may contribute a measure of relief to the oc-4 cupants of the vehicle, but which involve the disadvantages of extra equipment With its added complication and weight.

l have invented and herein describe, a vehicle spring which in itseltl possessesall the mal capacities of the shock absorber, and at the saine time ai'i'ords all the advantages ot the ordinary well constructed vehicle sprii Y.

mbe di wing hereto annexed which shows i in perspective and cross section the end of a vehicle spring, illustrates my invention.

l take an ordinary vehicle spring conirposei'l ot' a sheat' ot' steel spring-leaves to be assembled in the usual manner. Before assembling the spring leaves L, l warm them lo a temperature high enough to melt wax-.- such as bees\\'ax,--aiid coat the surfaces 'of the leaves evenly with a film ot wax. This may be done by dipping' the leaves in melted wax, or by any mode which insures the eventual spreading ot' the Wax ilin evenly on the metal surface. The spring leaves are then assembled in the usual way, with the wax lilms lV between adjacent leaves.

Specification of Letters Patent.

Patented Apr.. 23, 1912..

Application tiled September 22, 1911. Serial No. 650,819,

l/Vax, such as beeswax, is possessed of lnbricating qualities of a loiv order, will prevent two surfaces in Contact from sticking or chattering when slid one over the other, While alloivingg a smooth but sluggish inove ment. In a vehicle spring provided with wax tlins as above described, the effect of the Wax is to retard the response of the spring to sudden shock, and to give the vehicle suspended on the springs that smooth undulatingr movement which has been the object of all the contrivers of shock absorbers. Moreover, the wax retardant between the spring -leaves is preservative of the metal, and prevents the spring from squeaking. It does not prevent the springp from flexing under steady load to the saine extent as it Would without the Wax-films, but causes the springto lag in its response to sudden and violent stresses.

lVaX applied to smooth steel surfaces in the manner above described, remains closely adherent to the metal and will not be dis` tui-bed or removed by friction, even after long service. To be sure, any surplus of wax will at rst be rubbed ott and squeezed out from between the spring leaves, but the effective wax film remains and willpert'orm service for an indefinitely long time.

lWhat l claim and desire to secure by Let.- I

ters Patent is:

A" vehicle spring composed of resilient leaves in sliding contact with each other, having a film ot' wax between adjacent leave.

Signed by me at Boston, lvlassacliusetts, this 18th day of September, 1911.

WILLIAM R. PARK.

Witnesses: I I

ODIN ROBERTS, CHARLES D. WoonnnniiY. 

